Am If And Rf Alignment Procedure (Part I Mw Section) - Rotel Rt-226 Technisches Handbuch

AM SIGNAL
GENERATOR

AM IF and RF Alignment Procedure (Part I MW Section)

Part l: MW Section (AM/FM,
Instruments: AM Signal Generator and AC VTVM.
Notes: : Set Function Switch to "AM" or "MW" position. Input signal must be kept aslow as possible to avoid AVC
action.
Step
Coupling
Pin No.4 (on
IF board).
1
through a 0.01
mfd. capacitor.
Test Loop
2
Radiate signal
into ferrite
loop-stick
3
antenna.
4 Repeat steps 2 and 3 until no further improvement
CHASSIS
IC 101
PIN
AM IFT
3rd.
Fig. 1. AM IF and RF Alignment Hook-Up (AM/FM, LW/MW/FM)
Abb. 1. MW-ZF und HF-Abgleich
Fig. 1. Alignment
LW/MW/FM)
Generator
Frequency
455KHz (400Hz
30% Mod.)
600KHz (400Hz
30% Mod.)
1400KHz
(400Hz
Mod. )
LOOI
TOP VIEW (AM PORTION )
L 201 (AMFM ONLY)
AM OSC
CTI.
L 202 AM OSC ANT
AM IFT 1st.
AM IFT 2nd.
AM IF et HF (AWFM,
Tuning Dial
No interfering L202, L203
at low end of and L204
scale. (on IF board).
L201 (OSC) and
600KHz on
LOOI (ANT coil)
dial scale.
1400KHz on CT5 (OCS) and
CT4 (ANT)
dial scale.
Front-end.
is noticed.
-3-
(MW/UKW, LW/MW/UKW)
LW/MW/UKW)
Adjust Adjust for
Maximum
reading on
AC VTVM.
all on